S/H

Comparator

CDAC

Input

MUX

AV

DD

REF

IN

SAR

S/H

Comparator

CDAC

REF

OUT

AGND

SAR

10-BitDAC

2.5VReference

CHA0+

CHA0-

CHA1+

CHA1-

BV

DD

DB[11:0]

CS

CLOCK

WR

RD

BUSY

CONVST

BGND

CHB0+

CHB0-

CHB1+

CHB1-

Input

MUX

ADS7865

www.ti.com

SBAS441C – OCTOBER 2008 – REVISED APRIL 2012

Dual, 12-Bit, 3+3 or 2+2 Channel, Simultaneous Sampling

Analog-to-Digital Converter

Check for Samples: ADS7865

1

FEATURES

DESCRIPTION

The ADS7865 is a dual, 12-bit, 2MSPS analog-to-

2

•

Six Pseudo- or Four Fully Differential Inputs

digital converter (ADC) with four fully differential or six

•

SNR: 71.7dB, THD: –87dB

pseudo-differential input channels grouped into two

•

Programmable Channel Sequencer

pairs for high-speed, simultaneous signal acquisition.

Inputs to the sample-and-hold (S/H) amplifiers are

•

Programmable and Buffered Internal 2.5V

fully differential and are maintained differentially to

Reference

the input of the ADC. This architecture provides

•

Flexible Power-Down Features

excellent common-mode rejection of 72dB at 100kHz,

•

Variable Power-Supply Ranges: 2.7V to 5.5V

which is a critical performance characteristic in noisy

environments.

•

Low-Power Operation: 44mW Maximum at 5V

•

Operating Temperature Range:

The ADS7865 is pin-compatible with the ADS7862,

but

offers

additional

features

such

as

a

–40°C to +125°C

programmable channel sequencer and reference

•

Pin-Compatible Upgrade for the ADS7862

APPLICATIONS

three channels per ADC, and several power-down

features.

•

Motor Control

•

Multi-Axis Positioning Systems

The ADS7865 is offered in a TQFP-32 package. It is

specified over the extended operating temperature

•

Three-Phase Power Control

range of –40°C to +125°C.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.